Abusive Hosts Blocking List

The AHBL is an aggressive multifaceted blacklist of systems, networks, and domains that are abusive or open to widespread abuse.

It is not simply a spam blacklist, or an open proxy blacklist, or an open relay blacklist. We list for a variety of technical and non-technical criteria. We differ from other blacklists primarily in our broad scope, and willingness to expand that scope where appropriate to include new categories of internet abuse.